Stimulus-induced drop episodes in Coffin-Lowry syndrome

Area of Science:

• Genetics
• Neurology
• Rare Diseases

Background:

• Coffin-Lowry syndrome (CLS) is an X-linked semidominant disorder.
• It results from loss-of-function mutations in the Rps6ka3 gene, encoding ribosomal S6 kinase 2 (RSK2).
• CLS presents with psychomotor and growth retardation, and progressive skeletal abnormalities.

Purpose of the Study:

• To describe the phenomenon of stimulus-induced drop episodes (SIDEs) in Coffin-Lowry syndrome patients.
• To highlight the clinical heterogeneity of these non-epileptic events.

Main Methods:

• Clinical observation and description of patient cases exhibiting SIDEs.
• Review of existing literature on Coffin-Lowry syndrome and associated paroxysmal disorders.

Main Results:

• A subset of CLS patients presents with stimulus-induced drop episodes (SIDEs).
• These episodes are characterized by sudden falls, typically lasting seconds, triggered by stimuli.
• SIDEs manifest heterogeneously, resembling cataplexy or hyperekplexia.

Conclusions:

• Stimulus-induced drop episodes (SIDEs) are a distinct clinical feature in some Coffin-Lowry syndrome patients.
• The pathophysiology underlying SIDEs in CLS remains poorly understood and warrants further investigation.